What should a client learn about taking sildenafil (Viagra)?

The instruction to report rebound priapism that occurs for 4 hours or more highlights a critical safety aspect related to sildenafil, which is used to treat erectile dysfunction. Priapism is a prolonged and often painful erection that is not associated with sexual desire or stimulation, and it can occur as a rare but serious side effect of sildenafil. If an individual experiences an erection lasting longer than 4 hours, it can lead to significant complications, including penile tissue damage. Therefore, it's crucial for clients to be aware of this potential side effect and understand the importance of seeking immediate medical attention if it occurs. Awareness of this condition and prompt reporting can help prevent serious complications and ensure safe use of the medication.

The other options may contain information that could be partially true or misleading, potentially leading to misunderstandings about the proper use of sildenafil.